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| Number | Title | Issue Date |
| 8189180 | Optical fiber transmission line measurement apparatus and system A measurement apparatus for measuring an optical fiber transmission line used to connect to an opposite apparatus, the measurement apparatus includes a transmission part for generating a measurement packet used for measuring a length of a first and second optical fi... | 05/29/2012 |
| 8174685 | Measurement of nonlinear effects of an optical path A network device may include a receiver to receive optical pulses from an optical path, wherein the optical pulses include a plurality of intensities and represent data. The network device may also include a processor to determine a rate of bit errors introduced dur... | 05/08/2012 |
| 8164744 | Inspection tip for a fiber optic inspection probe An inspection probe is disclosed for use with a fiber optic adapter. The inspection probe can inspect a terminated end of an optical fiber within the fiber optic adapter. The fiber optic adapter can include a ferrule receiver located between first and second ports. ... | 04/24/2012 |
| 8154715 | Method for monitoring and measuring optical properties of device in polarization maintaining fibers by using reference fiber bragg grating and fiber components manufactured thereby A method for measuring and monitoring the state of polarization (SOP) of a polarization maintaining (PM) fiber using a narrowband fiber Bragg grating (FBG) written on the same is provided. The PM fiber comprises a first narrowband reference FBG which is used as a re... | 04/10/2012 |
| 8144315 | Method and apparatus for characterizing a multilayered structure An apparatus and method for characterizing the complex coupling coefficient of a multilayered periodic structure either during or after inscription is described. This apparatus is capable of continuously measuring the complex reflectivity at single or multiple wavel... | 03/27/2012 |
| 8144314 | Spectral measurement apparatus and measurement method utilizing Brillouin scattering The present invention relates to a spectral measurement apparatus and measurement method utilizing Brillouin scattering, which judge the state of the temperature or strain of an optical fiber more quickly. The spectral measurement apparatus comprises a light source,... | 03/27/2012 |
| 8139209 | System and method for measuring a laser-induced damage threshold in an optical fiber A system for measuring a laser-induced damage threshold in an optical fiber may include a lens to direct a first laser beam through a core of the optical fiber. The system may also include an optical arrangement to direct a second laser beam through an exterior surf... | 03/20/2012 |
| 8134696 | Measuring Brillouin backscatter from an optical fibre using a tracking signal A method for measuring Brillouin backscattering from an optical fiber, includes frequency mixing a first signal with a frequency representative of the Brillouin frequency shift in backscattered light received from a deployed optical fiber with a second signal at a f... | 03/13/2012 |
| 8130370 | Selection of a signal input from an optical fiber member Methods and systems for analyzing optical parameters of a selected optical fiber member are disclosed. A signal input from an optical fiber member may be selected by instructing a corresponding optical separation device. The output from the corresponding optical sep... | 03/06/2012 |
| 8120762 | Light guide and optical sensing module input device and method for making same A light guide has a first surface and a second surface with diffractive structures. A slanted facet is provided at one corner of the light guide. The diffractive structures have concentric fringes centered near the slanted facet. Fringes are arranged such that a lig... | 02/21/2012 |
| 8115913 | Light pulse generator and optical time domain reflectometer using the same There is provided a light pulse generator. The light pulse generator includes: a laser diode; a voltage source that provides a bias voltage to the laser diode; a switching element that causes the laser diode to emit a light pulse by directly modulating the laser dio... | 02/14/2012 |
| 8111385 | Quantum dot-mediated optical fiber information retrieval systems and methods of use The present disclosure relates to a non-invasive and real-time diagnostic analysis concept for an operational single mode optical fiber communication system and methods of using said system. The system comprises an optical fiber capable of being diagnosed non-invasi... | 02/07/2012 |
| 8111386 | Measuring modal content of multi-moded fibers The output modal content of optical fibers that contain more than one spatial mode may be analyzed and quantified by measuring interference between co-propagating modes in the optical fiber. By spatially resolving the interference, an image of the spatial beat patte... | 02/07/2012 |
| 8102519 | System and method for measuring dispersion A method for measuring dispersion in an optical fiber is provided and includes the following steps. A periodic wavelength variation pulse light signal is generated by a periodic frequency-swept pulse light source, in which the periodic wavelength variation pulse lig... | 01/24/2012 |
| 8098371 | Apparatus for measuring residual stress of optical fiber The present invention relates to an apparatus for measuring a residual stress of an optical fiber. More particularly, the present invention relates to an apparatus for measuring residual stress of an optical fiber which is provided with a variable polarizer of which... | 01/17/2012 |
| 8089619 | Process for manufacturing a microstructured optical fibre and method and system for on-line control of a microstructured optical fibre A manufacturing process of a microstructured optical fiber including a void-containing region, includes the steps of: drawing a microstructured optical fiber along a longitudinal direction from a heated preform, wherein the optical fiber is continuously advanced alo... | 01/03/2012 |
| 8081306 | Method and system for localizing an attenuation change location in an optical waveguide The invention provides a method and a system for localizing an attenuation change location in an optical waveguide, wherein the attenuation change location can be determined depending on a time difference (ΔT) between signal power change instants of optical signals... | 12/20/2011 |
| 8077298 | Apparatus for monitoring optical obstructions in an optical split network and method thereof An apparatus and method for monitoring optical fiber obstructions in an optical split network is described. The monitoring apparatus comprises a broadband-monitoring light source module, an optical circulator, an optical spectral analyzer, a high-density multi-wavel... | 12/13/2011 |
| 8077299 | Method for measuring polarization characteristics of optical fiber, drawing method, method for identifying abnormal point, and method for configuring optical fiber transmission line The present invention relates to a measuring method, etc., comprising a structure for accurately measuring optical characteristics such as PMD of an optical fiber. The measuring method is a technique for measuring polarization characteristic distributions along the ... | 12/13/2011 |
| 8054455 | Optical amplifier provided with control function of pumping light, and optical transmission system using the same In an optical transmission system according to one aspect of the present invention, for transmitting a WDM light from a transmission station to a reception station, utilizing a Raman amplifier, the Raman amplifier comprises: an optical amplification medium; a pumpin... | 11/08/2011 |
| 8045143 | Optical phase domain reflectometer An apparatus to measure optical characteristics of an optical medium may include an optical source to generate an optical square wave for transmission into the optical medium and an optical receiver to receive a reflected optical waveform from the optical medium cau... | 10/25/2011 |
| 8040496 | System and method for an illumination-quality test An endoscopic illumination tester is provided for testing illumination quality of a light source. The endoscopic illumination tester includes an optical bridge that is removably interlockable with the light source. The endoscopic illumination tester includes an inte... | 10/18/2011 |
| 8013985 | Methods of measuring the refractive index profile of a transparent cylindrical object Methods of measuring the refractive index profile of a transparent cylindrical object, such as a fiber preform, are disclosed. The methods include transmitting light rays through the cylindrical object in a direction transverse to the central axis at different heigh... | 09/06/2011 |
| 8013986 | Measuring brillouin backscatter from an optical fibre using channelisation Methods and apparatus for measuring Brillouin backscattering from an optical fiber. A pulse of light with a first frequency is launched into an optical fiber. Backscattered light is received from the fiber, which includes Brillouin spectral line at a second frequenc... | 09/06/2011 |
| 8013987 | Method and apparatus for fiber optic signature recognition A method and apparatus is disclosed for use in fiber optic signature recognition to analyze buried optical fiber to identify a non-threat area along a fiber route and to discontinue monitoring for disturbances along that area of the cable route. The technique includ... | 09/06/2011 |
| 8009279 | Characterization of non-linear optical materials using bragg coupling Methods of characterizing non-linear optical materials and fabricating wavelength conversion devices are provided. The method of characterizing non-linear optical materials comprising a periodically poled waveguide layer and at least one waveguide region includes co... | 08/30/2011 |
| 7999930 | Detection system and optical fiber for use in such system A detection system comprising: (i) an optical fiber, the optical fiber having (a) a length L≧1 km; (b) beat length between 10 m and 100 m; and (c) beat length uniformity over any distance of at least 100 m within the length L is characterized by standard deviation... | 08/16/2011 |
| 7995197 | Distributed backscattering The present invention relates to a method for detecting or inferring a physical disturbances on a communications link, in particular by using distributed backscattering. The method includes the steps of: transmitting test signals onto a link; receiving test signals ... | 08/09/2011 |
| 7995198 | Optical fiber feature distribution sensor The present invention relates to an optical fiber characteristic distribution sensor comprising a structure to effectively reduce the measurement errors of position in the temperature distribution measurement etc. The sensor comprises an optical fiber section, part ... | 08/09/2011 |
| 7986401 | Birefringent fibers orientation measurement Methods and apparatus to determine the orientation of randomly arranged birefringent fibers are disclosed. One method comprises emitting light, creating Ni polarization states of the emitted light, illuminating the birefringent fibers with the emitted lig... | 07/26/2011 |
| 7982865 | Method and device for monitoring an optical amplifier, in particular, an optical fiber amplifier The invention relates to a method for monitoring an optical amplifier, in particular, an optical fiber amplifier which has an optical input port and an optical output port. The optical pumping power of the amplifier is presumed to be directly proportional to the ele... | 07/19/2011 |
| 7978319 | Optical switching method and optical switch In a method and an optical switch by which a signal light is accurately switched even if a polarization state of a signal light inputted has a fluctuation, power of an output light of a polarizer which receives a signal light extracted from an output light of a nonl... | 07/12/2011 |
| 7973914 | Physical quantity measuring apparatus utilizing optical frequency domain reflectometry and method for temperature and strain measurement using the apparatus A physical quantity measuring apparatus utilizing optical frequency domain reflectometry includes a tunable laser; a first polarization maintaining fiber; a polarization maintaining coupler; a second polarization maintaining fiber; a third polarization maintaining f... | 07/05/2011 |
| 7969562 | Method and apparatus for measuring the birefringence autocorrelation length in optical fibers Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spe... | 06/28/2011 |
| 7969561 | Apparatus and method for monitoring extinction ratio of optical signals An apparatus for monitoring extinction ratio (ER) of optical signals comprises an optical spectrum analyzing unit, an ER monitoring control unit and an ER monitoring output unit. The optical spectrum analyzing unit measures two peak values corresponding to level one... | 06/28/2011 |
| 7956993 | Method for increasing accuracy of measurement of mean polarization mode dispersion A method of determining a mean square differential group delay associated with a length of optical fiber. The method including measuring a polarization mode dispersion vector as a function of frequency, using a frequency-domain polarization mode dispersion measureme... | 06/07/2011 |
| 7956992 | Optical cable testing A method is disclosed for testing optical fiber connection quality of an optical drop fiber between a telecommunications system and a subscriber connection box in a multi-dwelling unit or other subscriber premises before connection to other subscriber equipment. An ... | 06/07/2011 |
| 7952695 | Scanning spectrometer with multiple photodetectors A scanning optical spectrometer with a detector array is disclosed, in which position of focused spot of light at the input of a dispersive element such as arrayed waveguide grating (AWG) with a slab input, is scanned using a micro-electro-mechanical (MEMS) tiltable... | 05/31/2011 |
| 7948615 | Non-destructive testing of an integrated optical coupler in an integrated optical circuit A non-destructive method for characterizing a surface-illuminated integrated optical coupler associated with an optical waveguide, comprising the steps of measuring the reflection coefficient on a first region of the coupler at a distance from the optical waveguide ... | 05/24/2011 |
| 7948614 | Optical-fiber-characteristic measuring device and optical-fiber-characteristic measuring method A measurement precision is improved and a measurement range is extended by efficiently suppressing a noise level of integrated unnecessary components from non-correlation positions. Measuring means 33 detects the Brillouin gain of a probe light output from a ... | 05/24/2011 |
